Lady Frederica Susanna Schomberg gained the title Countess of Holderness when she married Robert Darcy, 3rd Earl of Holderness. In 1724 she married Hon. Benjamin Mildmay and her married name became Mildmay. Her titles included Countess FitzWalter and 3rd Countess of Mértola
Reference:
(http://en.wikipedia.org/wiki/Frederica_Mildmay,_Countess_FitzWalter).
Dates: to
Occupation: Unknown
Relationship to Sloane: Virtual International Authority File: